Alkali-lime-silica Glass vs. Alumina
Alkali-lime-silica glass belongs to the glass and glass-ceramics classification, while alumina belongs to the oxide-based engineering ceramics. There are 11 material properties with values for both materials. Properties with values for just one material (16, in this case) are not shown.
For each property being compared, the top bar is alkali-lime-silica glass and the bottom bar is alumina.
Metric UnitsUS Customary Units
Mechanical Properties
| Elastic (Young's, Tensile) Modulus, GPa | 78 | |
| 220 to 370 |
| Flexural Strength, MPa | 34 to 170 | |
| 260 to 430 |
Thermal Properties
| Thermal Expansion, µm/m-K | 9.0 | |
| 6.7 to 8.2 |
Electrical Properties
| Dielectric Constant (Relative Permittivity) At 1 Hz | 7.1 to 7.5 | |
| 8.0 to 9.0 |
| Dielectric Strength (Breakdown Potential), kV/mm | 28 | |
| 8.9 to 12 |
| Electrical Dissipation At 1 Hz | 0.022 to 0.052 | |
| 0.00031 to 0.0011 |
| Electrical Dissipation At 1 MHz | 0.0088 to 0.053 | |
| 0.00049 to 0.0013 |
| Electrical Resistivity Order of Magnitude, 10x Ω-m | 10 | |
| 6.2 to 14 |
Otherwise Unclassified Properties
| Density, g/cm3 | 2.7 | |
| 3.4 to 4.1 |
Common Calculations
| Stiffness to Weight: Axial, points | 16 | |
| 35 to 53 |
| Stiffness to Weight: Bending, points | 53 | |
| 57 to 62 |